stdio-common/_itoa.h

   1 /* Internal function for converting integers to ASCII.
   2 Copyright (C) 1994, 1995, 1996 Free Software Foundation, Inc.
   3 This file is part of the GNU C Library.
   4
   5 The GNU C Library is free software; you can redistribute it and/or
   6 modify it under the terms of the GNU Library General Public License as
   7 published by the Free Software Foundation; either version 2 of the
   8 License, or (at your option) any later version.
   9
  10 The GNU C Library is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 Library General Public License for more details.
  14
  15 You should have received a copy of the GNU Library General Public
  16 License along with the GNU C Library; see the file COPYING.LIB.  If
  17 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  18 Cambridge, MA 02139, USA.  */
  19
  20 #ifndef _ITOA_H
  21 #define _ITOA_H
  22 #include <sys/cdefs.h>
  23
  24 /* Convert VALUE into ASCII in base BASE (2..36).
  25    Write backwards starting the character just before BUFLIM.
  26    Return the address of the first (left-to-right) character in the number.
  27    Use upper case letters iff UPPER_CASE is nonzero.  */
  28
  29 extern char *_itoa __P ((unsigned long long int value, char *buflim,
  30                          unsigned int base, int upper_case));
  31
  32 static inline char * __attribute__ ((unused))
  33 _itoa_word (unsigned long value, char *buflim,
  34             unsigned int base, int upper_case)
  35 {
  36   extern const char _itoa_upper_digits[], _itoa_lower_digits[];
  37   const char *digits = upper_case ? _itoa_upper_digits : _itoa_lower_digits;
  38   char *bp = buflim;
  39
  40   switch (base)
  41     {
  42 #define SPECIAL(Base)                                                         \
  43     case Base:                                                                \
  44       do                                                                      \
  45         *--bp = digits[value % Base];                                         \
  46       while ((value /= Base) != 0);                                           \
  47       break
  48
  49       SPECIAL (10);
  50       SPECIAL (16);
  51       SPECIAL (8);
  52     default:
  53       do
  54         *--bp = digits[value % base];
  55       while ((value /= base) != 0);
  56     }
  57   return bp;
  58 }
  59
  60 #endif  /* itoa.h */